I want to add a helix restraint to some residues in each monomer of my
homodimer model, I followed the example given in Modeller 9v8 Manual
but It gives me the following error (Is it a residue numbering problem?):
Yes. Your sequence has multiple chains, so you'll need to specify the
chain ID as well when you select residues (maybe '29:A').
This is my alignment file, which worked well without adding the helix
restraint: